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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Summary Of Significant Accounting Policy [Line Items]    
Tax benefit in other comprehensive income (loss) $ (17) $ 104
ASU 2016-13 [Member]    
Summary Of Significant Accounting Policy [Line Items]    
Change in Accounting Principle, Accounting Standards Update, Adopted [true false] true  
Change in Accounting Principle, Accounting Standards Update, Adoption Date Jan. 01, 2020  
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false] true  
ASU 2019-12 [Member]    
Summary Of Significant Accounting Policy [Line Items]    
Change in Accounting Principle, Accounting Standards Update, Adopted [true false] true  
Change in Accounting Principle, Accounting Standards Update, Adoption Date Apr. 01, 2020  
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false] true  
Adjustments for New Accounting Principle, Early Adoption [Member]    
Summary Of Significant Accounting Policy [Line Items]    
Tax benefit in other comprehensive income (loss) $ (100)  
Overstatement Long-term Investment Balance at Remeasured Cost Basis [Member]    
Summary Of Significant Accounting Policy [Line Items]    
Amount of revision   2,800
Errors in Net Investment Gain [Member]    
Summary Of Significant Accounting Policy [Line Items]    
Amount of revision   $ 1,500